I have read man is a bit of woman as well as woman is a bit of man. Both are by product of sex. Man has more man hormones and the reverse is true for woman hence more hormone flow to top becoming breast for woman and for man becoming a penis. So both have nipples while women nipples are more pleasureable and sensitive and can be orgasmic as well.

The answer is that as embryos men and women have similar tissues and body parts. If anything the embryo follows a 'female template'. That is why nipples are present in both sexes. It is the effect of the genes, the Y chromosome and the hormone testosterone that brings about the changes and masculinises the embryo. Testosterone promotes the growth of the penis and testicles. Because nipples are there before this process begins the nipples stay!

As the volume of skin on the chest is a sizable area. When muscles are worked or the body goes into extreme contorsion the skin area requires yeild zones.

Same principle as the power company coiling several yards of wire on the telephone pole, so when the tree collapses on the wires, 'slack' is harmoniously fed-out (in anticipation) in a stress event keeping the utility operational.

I have read man is a bit of woman as well as woman is a bit of man. Both are by product of sex. Man has more man hormones and the reverse is true for woman hence more hormone flow to top becoming breast for woman and for man becoming a penis. So both have nipples while women nipples are more pleasureable and sensitive and can be orgasmic as well.

The answer as to why men have nipples may well be related to the fact that all human embryos developing in the womb initially have the ability to sexually differentiate into either male or female individuals. It is further along, during fetal development, that a gender-specific path of sexual development is followed.

The default sexual development path in humans is female. The presence of a Y chromosome, and, thus, the accompanying expression of gene products from genes found exclusively on the Y chromosome in male fetuses are what force sexual development to deviate along a different ("male") subsequent developmental path.

So, to answer your question OP, human males may have nipples because human females must have nipples to provide milk for their infants. This possibility is supported by the fact that males and females follow a common sexual developmental path up to a certain point in in utero development.